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Finding the Fourth Proportional to 561.02, 841.28 and 214.43

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Solution

The fourth proportional to 561.02, 841.28 and 214.43 is: 321.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.02 : 841.28 = 214.43 : x
  2. Step 2: Convert to fraction form
    561.02/841.28 = 214.43/x
  3. Step 3: Cross multiply
    561.02x = 841.28 × 214.43
  4. Step 4: Simplify right side
    561.02x = 180,390.39
  5. Step 5: Solve for x
    x = 180,390.39/561.02
  6. Step 6: Final answer
    x = 321.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.